power conditioner for cd transport and dac?

I think it is recommended by at least some experts to use separate power conditioners for digital and analogue to keep the digital noise out of the analogue power source. It is even recommended by some to use separate circuits for analogue and digital. Some higher end power conditioners have a dedicated digital input. I just use two cheap ones--one for analogue and one for digital.

I use isolation transformers on my digital front end gear. That is where I have found a transformer to have the most effect. Perhaps this is because, besides removing noise from the AC to the gear, they also isolate the digital gear from the rest of the system.